Electro-magnet



(No Model.)

E. D. MGORAGKEN.

ELECTRO MAGNET.

No. 314,041. Patented Mar. 17, 1885.

1 It.. :l:

UNITED STATES PATENT GEEICE` EDVIN D. MGCRACKEN, OE PATERSON, NEW JERSEY.

ELECTRO-MAGNET.

IZPSEFICA-rffll forming part of Letters Patent No. 314,041, dated v'areh 17, 1355.

Application tileil May 17, 1884.

To all whom it muy concern:

Be it known that I, EDWIN D. McCEltcKEN, of the city of Paterson, in the county ot' Pas saic and State of New Jersey, have invented a certain new and useful Improvement in Electro-Magnets7 of which the following is a speciftcation.

In the making of electromagncts it is of course of primary importance that the convolutions of wire of which the magnet is wound should be perfectly insulated l'rom each other, and in very many kinds of electric apparatussnch, for example, as electric lamps and telegraph-instruments-it is a great advantage to have the magnets as small in size as possible and consistent with the necessary strength.

The Object 0f my invention is toprovide an electro-magnet which shall have the convolutions of wire perfectly insulated, and which f for a given length and gage of wire shall be smaller than any magnet heretofore made in which the convolutions of wire were as perfectl y insulated.

The invention consists in an electro-magnet coil the wire of which is insulated by aspiral wrapping of paper.

The invention also consists in an electromagnet formed ot' convolutions of wire having a covering consisting of a spirally-wound strip or strips of pure vegetable paper, which forms of itself the insu]ating-covering of the wire.

In the accompanying drawings, Figure 1 is a sectional view of a magnet embodying my invention; and Fig. 2 represents a piece of the insulated wire employed, the thickness of the wire and strips being greatly exaggerated to illustrate them more clearly.

Similar letters ot" reference designate corresponding parts in both gures.

A designates the spool, having heads a a, and on which the wire b is wound closely in the usual way. After winding the magnet an i t i i i l i (No model.)

' outer envelope or covering, c,of vulcanized india-rubber, leather, or any other suitable material, is applied to give thelnagnet atinish and to protect the wire. rlhe wire b before being wound is covered with a thin insulation of paper made from pure vegetable tiber and applied in the form of a strip, d, wound spirally and lapped on itself about half its width. It it is desired to obtain a thicker covering, a second strip, d', of paper may be likewise applied, breaking joints with the first or previously-applied strip.

In applying the strip of paper l may einploy athin solution ot' shellac or other adhe sive substance laid onto the inner side of the strip; but in many cases the paper strip may be laid on tightly and spirally without any adhesive substance. the paper being very slightly dampened with water before winding it.

For the spiral winding l employ very thin and tough paper, and when a single strip of paper is wound as described [obtain a double thickness of paper throughout the wire,which will add but three or four thousandths of an inch to the diameter of the wire.

That I claim as my invention, and desire to secure by Letters Patent, is-

1. An electro-magnet coil the wire of which is insulated by a spiral wrapping ot' paper, substantiallyras herein described.

2. An electro magnet formed ot" convolutionsof wire having a covering consisting of a spirally-wouiul strip or strips of pitre vegetable paper, which forms of itself the insulatingcovcring of the wire. substantially as and for the purpose herein described.

E. D. MCCDAGKEN.

Vv'itnesses:

C. HALL, FEEDK. lLtYrEs. 

